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Acquisition - Pro-forma Results of Acquisitions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition, Pro Forma Information [Line Items] |  |  |  |
Revenue | $ 184,393 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 225,700 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 353,230 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 430,051 us-gaap_BusinessAcquisitionsProFormaRevenue
Income from operations | 36,342 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax | 80,474 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax | 62,262 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax | 151,477 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Net income | $ 24,031 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 47,433 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 40,013 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 92,804 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per share, basic | $ 0.33 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.63 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 0.55 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 1.20 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Net income per share, diluted | $ 0.32 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.62 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 0.53 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 1.17 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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